>>62255843>>622558437of9 isn't a star fleet officer so she shouldn't even be allowed to wear a uniform (STOLEN VALOR!), can't just let any jackass wear a uniform, that's like impersonating an officer or some shit. She's a crew member sure, but not an officer (like Guinan).
As for the rest - female privilege, they think they can wear whatever they want on duty because they have a vagina. There is even an episode of TNG where a superior officer asks Deanna Troi why the fuck she's wearing civilian clothes while on duty, he literally has to order her to wear her damn uniform on duty.